Castrol India Limited supplies Sludge Protective Lubricating Engine Oil. Castrol India Limited is an ISO 9001- 2000 recognised company a wide range of automotive and industrial lubricants for passenger car engines, trucks, motorcycles and scooters. The Sludge Protective Lubricating Engine Oil available under the bran name "GTX Compact" is designed to be used on tata nano engines and is available in the pack size 2.5 litres. The Sludge Protective Lubricating Engine Oil provides safety from under load, heat and high revs extending engine life.